CN107817383A - A kind of High Precise Frequency Measurement System based on moving emitter - Google Patents
A kind of High Precise Frequency Measurement System based on moving emitter Download PDFInfo
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- CN107817383A CN107817383A CN201711041763.0A CN201711041763A CN107817383A CN 107817383 A CN107817383 A CN 107817383A CN 201711041763 A CN201711041763 A CN 201711041763A CN 107817383 A CN107817383 A CN 107817383A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
Abstract
The invention discloses a kind of High Precise Frequency Measurement System based on moving emitter, belong to technical field of frequency measurement.It includes reference signal source module, measured signal source module, first frequency conversion module, second frequency conversion module, analog signal processing module, allocator module, phase locking frequency multiplying module, porch extraction module, alien frequencies quantization phase demodulation module, phase difference pulse processing module, pulse counter module and count value memory module.The present invention uses alien frequencies quantization phase demodulation processing method, can increase substantially the precision of frequency measurement, biological treatability and security reliability of the strengthening system under complex background, be a kind of important improvement to prior art.
Description
Technical field
The present invention relates to technical field of frequency measurement, particularly relates to a kind of High Precision Frequency based on moving emitter
System.
Background technology
Frequency measurement is one of accurate measurement physical field key issue to be solved, when the solution of this problem contributes to
Between the precision of the transmission and comparison of frequency, phase noise measurement and suppression and New type atom frequency marking improve, and to whole satellite
Strong impetus is played in the further development of navigation system and equipment technology.Frequency measuring system traditional at present is established
On step-by-step counting basis, be primarily present two aspect the defects of：When limited by filler pulse frequency, second, in the presence of ±
The counting error of 1 word.To reduce this defect, measurement accuracy is improved, popular way is by various frequencies in the world
Measuring method integrated use, such as analog interpolation and time vernier method are combined, can be reduced to ± 1 word count error
1/1000 or so, measurement accuracy can reach picosecond, but this method realizes that complex circuit designs, instrument cost are high, so as to limit
The popularity of its application is made.
The content of the invention
In view of this, the present invention proposes a kind of High Precise Frequency Measurement System based on moving emitter, and it can be significantly
Degree improves the precision of frequency measurement, biological treatability and security reliability of the strengthening system under complex background.
Based on above-mentioned purpose, technical scheme provided by the invention is：
A kind of High Precise Frequency Measurement System based on moving emitter, it includes reference signal source module, measured signal
Source module, first frequency conversion module, second frequency conversion module, analog signal processing module, allocator module, phase locking frequency multiplying
Module, porch extraction module, alien frequencies quantization phase demodulation module, phase difference pulse processing module, pulse counter module and
Count value memory module；
The reference signal source module is real by the ultrastability crystal oscillator for producing high stability reference signal
It is existing；
The measured signal source module is realized by the pulsed signal device for providing measured signal；
The first frequency conversion module and second frequency conversion module are by the frequency synthesis for producing radiofrequency signal
Device is realized；
The analog signal processing module is by the Schmidt trigger for reference signal to be transformed to square-wave pulse signal
Realize；
The allocator module has two signal output parts for exporting 1KHz and 4KHz square-wave pulse signals respectively, described
Allocator module realizes that the frequency-dividing counter can be produced for alien frequencies quantization phase demodulation by the frequency-dividing counter inside FPGA
1KHz and 4KHz square-wave pulse signals, wherein 1KHz square-wave pulse signals belong to measured signal, 4KHz square-wave pulse signal category
In reference signal；
The phase locking frequency multiplying module realizes that the phaselocked loop, which has, to be used to produce high frequency clock by the phaselocked loop inside FPGA
The double frequency function of pulse signal；
The porch extraction module passes through the edge type d type flip flop inside FPGA, 2 inputs and gate circuit and anti-phase
Device is realized, for extracting the forward position of 1KHz and 4KHz square-wave pulse signals；
The alien frequencies quantization phase demodulation module is realized that the level-type rest-set flip-flop has two by level-type rest-set flip-flop
Signal input part, for producing the phase difference pulse between reference signal and measured signal；
The phase difference pulse processing module realizes that the self-compiling program controls by the self-compiling program controller inside FPGA
Device is used to phase difference pulse carrying out quantization by unit of the greatest common factor (G.C.F.) cycle, produces using least common multiple one number time as interval
Pulse synchronous signal and step-by-step counting control signal；
The pulse counter module includes 3 function identical counters, this 3 counter combination step-by-step counting control letters
Number it is respectively used to that the complete cycle of measured signal, the complete cycle of reference signal and phase difference pulse width are counted and obtained
Count value；
The signal output part of the reference signal source module is connected with the signal input part of the first frequency conversion module,
The signal output part of the measured signal source module is connected with the signal input part of the second frequency conversion module, and described first
The signal output part of frequency translation module is connected with the signal input part of the analog signal processing module, and the second frequency becomes
The signal input part of mold changing block and the signal output part of analog signal processing module with the allocator module is connected, the mould
Intend signal input part of the signal output part of signal processing module also with the phase locking frequency multiplying module to be connected；The phase locking frequency multiplying mould
The signal output part of block is connected with the clock end of an edge type d type flip flop in the porch extraction module, the frequency divider
The 1KHz signal output parts and 4KHz signal output parts of module trigger with an edge type D in the porch extraction module respectively
The signal input part connection of device, the signal output part of each edge type d type flip flop is connected with a phase inverter respectively, for frequency divider
The 1KHz signals and 4KHz signals of module output, the original signal and its reverse signal of each signal are extracted by the porch
In module 1 input with gate circuit take with, so as to by two signal output parts of the porch extraction module it is defeated
Go out the signal leading edge of corresponding signal；Two signal output parts of the porch extraction module respectively with the alien frequencies quantization
Two signal input parts connection of level-type rest-set flip-flop, the signal output of the alien frequencies quantization phase demodulation module in phase demodulation module
End is connected with the signal input part of the phase difference pulse processing module, the signal output part of the phase difference pulse processing module
It is connected respectively with three pulse counters in the pulse counter module, the signal output part of three pulse counters is equal
It is connected with the count value memory module.
Optionally, the count value memory module is realized by the memory inside FPGA, for pulse count module
In the count value that obtains of each counter stored.
Optionally, the memory is FIFO memory cell.
Optionally, the counter is realized by the counter unit inside FPGA.
Optionally, in addition to for carrying out data processing and host computer that frequency is shown, the host computer is from the counting
It is worth at memory module and obtains count value, resolves the frequency values of measured signal according to count value and frequency measurement algorithm, and by frequency
Value is shown.
From narration above as can be seen that the beneficial effect of technical solution of the present invention is：
1st, relative to traditional frequency measurement technology, frequency synthesis and normalized circuit that the present invention need not be complicated,
But the frequency stability and reliability of system are significantly increased using alien frequencies quantization phase demodulation.Circuit in the present invention is set
Meter is simple, and development cost is low, and additional noise is small, further, since quantization of the greatest common factor (G.C.F.) cycle to phase difference pulse, when any
The phase difference porch at quarter using least common multiple one number time as interval stringent synchronization, so as to eliminate legacy frequencies measurement in ±
The counting error of 1 word.
2nd, as a result of the alien frequencies quantization phase-demodulating principle for being different from conventional phase comparison method, measurement of the invention point
Resolution and short-term frequency stability are increased substantially, and stability of the system under complex background is stronger, security and
Reliability is higher, and in radio frequency, the Measurement Resolution of optional frequency is better than 1 psec, the frequency measurement of system even in the range of X-band
Precision is better than 2.87E-12/s magnitudes.
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Background technology, technical principle and/or some specific embodiments make aid illustration.It should be noted that these accompanying drawings can
It can not also provide some to provide and have been described and belong to known in those of ordinary skill in the art often at this patent word segment
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And/or accompanying drawing content, more accompanying drawings, therefore these accompanying drawings below are designed in the case where not paying any creative work
Can cover can not also cover all technical schemes that this patent word segment is described.In addition, these accompanying drawings is specific interior
Containing needs the word content with reference to this patent to be determined, when word content and some obvious knot in these accompanying drawings of this patent
, it is necessary to which to carry out comprehensive descision be this on earth with reference to the narration of the common knowledge and this patent other parts of this area when structure is not consistent
The word segment of patent, which exists to exist in clerical mistake, or accompanying drawing, draws mistake.Especially, the following drawings is the figure of exemplary in nature
Piece, it is not intended that imply the protection domain of this patent, one of ordinary skill in the art is by reference to the text disclosed in this patent
Word content and/or accompanying drawing content, more accompanying drawings can be designed in the case where not paying any creative work, these are new
Technical scheme representated by accompanying drawing is still within the protection domain of this patent.
Fig. 1 is a kind of structural representation of the embodiment of the present invention.
Embodiment
For the ease of understanding of the those skilled in the art to the art of this patent scheme, meanwhile, in order that the technology of this patent
Purpose, technical scheme and beneficial effect are clearer, and the protection domain of claims is fully supported, below with tool
The form of body case makes further, more detailed description to the technical scheme of this patent.
A kind of High Precise Frequency Measurement System based on moving emitter, it includes reference signal source module, measured signal
Source module, first frequency conversion module, second frequency conversion module, analog signal processing module, allocator module, phase locking frequency multiplying
Module, porch extraction module, alien frequencies quantization phase demodulation module, phase difference pulse processing module, pulse counter module and
Count value memory module；
The reference signal source module is real by the ultrastability crystal oscillator for producing high stability reference signal
It is existing；
The measured signal source module is realized by the pulsed signal device for providing measured signal；
The first frequency conversion module and second frequency conversion module are by the frequency synthesis for producing radiofrequency signal
Device is realized；
The analog signal processing module is by the Schmidt trigger for reference signal to be transformed to square-wave pulse signal
Realize；
The allocator module has two signal output parts for exporting 1KHz and 4KHz square-wave pulse signals respectively, described
Allocator module realizes that the frequency-dividing counter can be produced for alien frequencies quantization phase demodulation by the frequency-dividing counter inside FPGA
1KHz and 4KHz square-wave pulse signals, wherein 1KHz square-wave pulse signals belong to measured signal, 4KHz square-wave pulse signal category
In reference signal；
The phase locking frequency multiplying module realizes that the phaselocked loop, which has, to be used to produce high frequency clock by the phaselocked loop inside FPGA
The double frequency function of pulse signal；
The porch extraction module passes through the edge type d type flip flop inside FPGA, 2 inputs and gate circuit and anti-phase
Device is realized, for extracting the forward position of 1KHz and 4KHz square-wave pulse signals；
The alien frequencies quantization phase demodulation module is realized that the level-type rest-set flip-flop has two by level-type rest-set flip-flop
Signal input part, for producing the phase difference pulse between reference signal and measured signal；
The phase difference pulse processing module realizes that the self-compiling program controls by the self-compiling program controller inside FPGA
Device is used to phase difference pulse carrying out quantization by unit of the greatest common factor (G.C.F.) cycle, produces using least common multiple one number time as interval
Pulse synchronous signal and step-by-step counting control signal；
The pulse counter module includes 3 function identical counters, this 3 counter combination step-by-step counting control letters
Number it is respectively used to that the complete cycle of measured signal, the complete cycle of reference signal and phase difference pulse width are counted and obtained
Count value；
The signal output part of the reference signal source module is connected with the signal input part of the first frequency conversion module,
The signal output part of the measured signal source module is connected with the signal input part of the second frequency conversion module, and described first
The signal output part of frequency translation module is connected with the signal input part of the analog signal processing module, and the second frequency becomes
The signal input part of mold changing block and the signal output part of analog signal processing module with the allocator module is connected, the mould
Intend signal input part of the signal output part of signal processing module also with the phase locking frequency multiplying module to be connected；The phase locking frequency multiplying mould
The signal output part of block is connected with the clock end of an edge type d type flip flop in the porch extraction module, the frequency divider
The 1KHz signal output parts and 4KHz signal output parts of module trigger with an edge type D in the porch extraction module respectively
The signal input part connection of device, the signal output part of each edge type d type flip flop is connected with a phase inverter respectively, for frequency divider
The 1KHz signals and 4KHz signals of module output, the original signal and its reverse signal of each signal are extracted by the porch
In module 1 input with gate circuit take with, so as to by two signal output parts of the porch extraction module it is defeated
Go out the signal leading edge of corresponding signal；Two signal output parts of the porch extraction module respectively with the alien frequencies quantization
Two signal input parts connection of level-type rest-set flip-flop, the signal output of the alien frequencies quantization phase demodulation module in phase demodulation module
End is connected with the signal input part of the phase difference pulse processing module, the signal output part of the phase difference pulse processing module
It is connected respectively with three pulse counters in the pulse counter module, the signal output part of three pulse counters is equal
It is connected with the count value memory module.
Optionally, the count value memory module is realized by the memory inside FPGA, for pulse count module
In the count value that obtains of each counter stored.
Optionally, the memory is FIFO memory cell.
Optionally, the counter is realized by the counter unit inside FPGA.
Optionally, in addition to for carrying out data processing and host computer that frequency is shown, the host computer is from the counting
It is worth at memory module and obtains count value, resolves the frequency values of measured signal according to count value and frequency measurement algorithm, and by frequency
Value is shown.
As a more specifical example, as shown in figure 1, a kind of High Precision Frequency system based on moving emitter
System, it includes reference signal source module, measured signal source module, two frequency translation modules, analog signal processing module, frequency dividing
Device module, phase locking frequency multiplying module, porch extraction module, alien frequencies quantization phase demodulation module, phase difference pulse processing module, arteries and veins
Rush counting module, count value memory module, data processing module and frequency display module；The signal of reference signal source module is defeated
Go out the signal input part held and connect two frequency translation modules respectively with the signal output part of measured signal source module, believe with reference
The signal input part of the signal output part connection analog signal processing module for the frequency translation module that number source module is connected, with quilt
Survey the signal output part for the frequency translation module that signal source module is connected and the signal output part point of analog signal processing module
Not Lian Jie allocator module signal input part, the signal output part of allocator module connects two porches extraction moulds respectively
The signal input part of block, the signal output part for the analog signal processing module that is connected with reference signal source module are connected lock phase
The signal input part of times frequency module, the signal output part of phase locking frequency multiplying module connect the letter of two porch extraction modules respectively
Number input, the signal output part of porch extraction module connect the signal input part of alien frequencies quantization phase demodulation module respectively,
The signal input part of the signal output part connection phase difference pulse processing module of alien frequencies quantization phase demodulation module, at phase difference pulse
The signal output part of reason module connects the signal input part of three pulse counter modules, the signal of three pulse counter modules respectively
Output end distinguishes the signal input part of connection count value memory module, and the signal output part of count value memory module is connected at data
Manage the signal input part of module, the signal input part of the signal output part rate of connections display module of data processing module.
By ultrastability crystal oscillator H800-U, (short-term frequency stability is described reference signal source module
4.3E-13/s magnitudes) realize, can also be by high-precision ultrastability crystal oscillator OSA8607BM (short-term frequency stabilities
Spend for 2.1E-13/s magnitudes) substitute, believe mainly for generation of the reference carried out with measured signal required for alien frequencies quantization phase demodulation
Number；
Described measured signal module is realized by pulsed signal device, for providing measured signal, provides tested letter
Number should be the frequency that moving emitter is launched is X-band pulse signal；
Described frequency translation module is realized that the frequency synthesizer is mainly by measured signal and with reference to letter by frequency synthesizer
Number frequency transformation to radio-frequency region, produce the radiofrequency signal used in alien frequencies quantization phase demodulation；
Described analog signal processing module is realized by Schmidt trigger 74HCT14.What reference signal source module provided
It is the sine wave signal of standard, alien frequencies quantization phase demodulation belongs to digitlization phase demodulation scope, it is necessary to use Schmidt trigger 74HCT14
Reference signal is transformed to square-wave pulse signal；
Described allocator module is realized that the division function of the frequency-dividing counter passes through by the frequency-dividing counter inside FPGA
Hardware description language writes program realization, and the 1KHz and 4KHz for alien frequencies quantization phase demodulation are produced by this frequency-dividing counter
Square-wave pulse signal, wherein 1KHz pulse signals belong to measured signal, and 4KHz pulse signals belong to reference signal；
Described phase locking frequency multiplying module is realized by the phaselocked loop (PLL) inside FPGA, is produced with the double frequency function of phaselocked loop
High-frequency clock pulse signal；
Described porch extraction module passes through the edge type d type flip flop inside FPGA, 2 inputs and gate circuit and anti-phase
Device unit is realized, for extracting the forward position of 1KHz and 4KHz square-wave pulse signals；High-frequency clock pulse signal is connected to edge type D and touched
The clock end of device is sent out, 1KHz square-wave pulse signals are connected to the signal input part of edge type d type flip flop, such 1KHz square-wave pulses letter
A high-frequency clock pulse cycle number will be delayed by, the signal output of edge type d type flip flop terminates to the signal input of phase inverter
End, the 1KHz square-wave pulse signals after being delayed by are negated the 1KHz side i.e. after the signal output part of phase inverter is delayed by
The inversion signal of wave pulse signal, this inversion signal is connected to 2 inputs and gate circuit list together with 1KHz square-wave pulse signals
The signal input part of member, the forward position of 1KHz square-wave pulse signals is obtained in the signal output part of 2 inputs and gate circuit unit, i.e., it is complete
Into the extraction in 1KHz square-wave pulse signals forward position；Equally, high-frequency clock pulse signal is connected to the clock of edge type d type flip flop
End, 4KHz square-wave pulse signals are connected to the signal input part of edge type d type flip flop, and such 4KHz square-wave pulse signals will be delayed by
In one high-frequency clock pulse cycle, the signal output of edge type d type flip flop terminates to the signal input part of phase inverter, after being delayed by
4KHz square-wave pulse signals be negated 1KHz square-wave pulse signals i.e. after the signal output part of phase inverter is delayed by
Inversion signal, the signal that this inversion signal is connected to 2 inputs and gate circuit unit together with 1KHz square-wave pulse signals is defeated
Enter end, obtain the forward position of 4KHz square-wave pulse signals in the signal output part of 2 inputs and gate circuit unit, that is, complete 4KHz side
The extraction in wave pulse signal forward position；
Described alien frequencies quantization phase demodulation module realized by improved level-type rest-set flip-flop, for produce reference signal and
Phase difference pulse between measured signal；By the forward position pulse signal of 1KHz square-wave pulse signals and 4KHz square-wave pulse signals
Forward position pulse signal is connected to the signal input part of level-type rest-set flip-flop, can be obtained in the signal output part of level-type rest-set flip-flop
Phase between phase difference between 1KHz square-wave pulse signals and 4KHz square-wave pulse signals, i.e. reference signal and measured signal
Poor pulse, before the lead and trail edge of the phase difference pulse is respectively 4KHz square-wave pulse signals and 1KHz square-wave pulse signals
Edge；
Described phase difference pulse processing module is realized by the self-compiling program controller inside FPGA, for by phase difference arteries and veins
Punching is quantified using the high frequency time-frequency cycle as unit, produces step-by-step counting control signal, and the step-by-step counting control signal includes one
The lead and trail edge and width of all phase difference pulses in individual least common multiple one number time；
Described pulse counter module includes 3 function identical counters, and 3 counters (being designated as first, second, third) combine
Step-by-step counting control signal, it is respectively used to wide to the complete cycle of measured signal, the complete cycle of reference signal and phase difference pulse
Degree is counted and obtains count value；Wherein, the forward position flip-flop number first accumulated counts of phase difference pulse, gained count value generation
The complete cycle issue of table measured signal, the rear of phase difference pulse represent reference along flip-flop number second accumulated counts, gained count value
The complete cycle issue of signal, the width of phase difference pulse as counter third trigger gate in all phase difference pulse widths
High frequency clock is counted, and when there is same count value, counter third completes all phases in a least common multiple one number time
Potential difference step-by-step counting；
Described count value memory module is realized by the memory inside FPGA, based on the acquisition of pulse count module
Numerical value is stored, and FIFO (FIFO) unit inside FPGA can realize memory function, can be pulse count module
The count value that block obtains is stored, and these stored count values will be sent at host computer by serial communication interface
Reason；
Described data processing module is realized by the processor inside host computer, is obtained for handling count value memory module
Count value and frequency measurement algorithm；For frequency measurement algorithm by hardware description language programming realization, the CPU inside host computer can
The count value and frequency measurement algorithm obtained to count value memory module is handled, and result is sent to host computer and shown
Device；
Described frequency display module is realized by host computer display, for showing the frequency measurement of measured signal i.e.
The frequency values of measured signal.
In order to ensure stable signal transmission, also in the output end and serial communication interface of count value memory module in the present invention
Input be respectively arranged with RS-232 output interfaces and input interface, RS-232 output interfaces are used for count value memory module
The count value of acquisition is sent to host computer, and RS-232 input interfaces are used to control signal be sent to FPGA.
Relative to traditional frequency measurement technology, the present invention is without complicated frequency synthesis and normalized circuit, profit
The frequency stability and reliability of system can be increased substantially with alien frequencies quantization phase demodulation.Circuit design letter in the present invention
Single, development cost is low, and additional noise is small, further, since quantization of the greatest common factor (G.C.F.) cycle to phase difference pulse, any time
Phase difference porch eliminates ± 1 word in legacy frequencies measurement using least common multiple one number time as interval stringent synchronization
Counting error.
It can be seen that as a result of the alien frequencies quantization phase-demodulating principle for being different from conventional phase comparison method, survey of the invention
Amount resolution ratio and short-term frequency stability are increased substantially, and stability of the system under complex background is stronger, safety
Property and reliability it is higher, in radio frequency, the Measurement Resolution of optional frequency is better than 1 psec, the frequency of system even in the range of X-band
Measurement accuracy is better than 2.87E-12/s magnitudes, is a kind of important improvement to prior art.
It is to be appreciated that to be intended merely to facilitate this area common for the above-mentioned narration for this patent embodiment
The exemplary description that technical staff understands this patent scheme and enumerated, does not imply that the protection domain of this patent is limited solely to
In this few example, those of ordinary skill in the art completely can on the premise of making and fully understanding to the art of this patent scheme,
In the form of not paying any creative work, by taking each example cited by this patent combination technique feature, replacing
Some technical characteristics, more technical characteristics etc. mode is added, obtain more embodiments, all these specific implementations
Mode is within the covering scope of patent claims book, and therefore, these new embodiments also should be in this patent
Protection domain within.
In addition, for the purpose for simplifying narration, this patent may also not enumerate some ordinary specific embodiments, this
A little schemes are that those of ordinary skill in the art can expect naturally after it understanding of the art of this patent scheme, it is clear that this
A little schemes should be also included within the protection domain of this patent.
For the purpose for simplifying narration, above-mentioned each embodiment may only up to for the extent of disclosure of ins and outs
The degree that can voluntarily make a decision to those skilled in the art, i.e. there is no disclosed ins and outs for above-mentioned embodiment,
Those of ordinary skill in the art completely can be in the case where not paying any creative work, in filling for the art of this patent scheme
Divide under prompting, completed by means of the disclosed document of textbook, reference book, paper, patent, audio-visual product etc., or, this
A little details are the contents that can voluntarily be maked decision according to actual conditions under being generally understood that of those of ordinary skill in the art.
It can be seen that even if these underground ins and outs, the open adequacy of the art of this patent scheme will not also be impacted.
In a word, it is any on the basis of explanation effect of the patent specification to claims protection domain is combined
Fall into the specific embodiment of patent claims book covering scope, within the protection domain of this patent..
Claims (5)
1. a kind of High Precise Frequency Measurement System based on moving emitter, it is characterised in that including reference signal source module, quilt
Survey signal source module, first frequency conversion module, second frequency conversion module, analog signal processing module, allocator module, lock
Phase times frequency module, porch extraction module, alien frequencies quantization phase demodulation module, phase difference pulse processing module, pulsimeter digital-to-analogue
Block and count value memory module；
The reference signal source module is realized by the ultrastability crystal oscillator for producing high stability reference signal；
The measured signal source module is realized by the pulsed signal device for providing measured signal；
The first frequency conversion module and second frequency conversion module are real by the frequency synthesizer for producing radiofrequency signal
It is existing；
The analog signal processing module is realized by the Schmidt trigger for reference signal to be transformed to square-wave pulse signal；
The allocator module has two signal output parts for exporting 1KHz and 4KHz square-wave pulse signals respectively, the frequency dividing
Device module realizes that the frequency-dividing counter can be produced for alien frequencies quantization phase demodulation by the frequency-dividing counter inside FPGA
1KHz and 4KHz square-wave pulse signals, wherein 1KHz square-wave pulse signals belong to measured signal, and 4KHz square-wave pulse signals belong to
Reference signal；
The phase locking frequency multiplying module realizes that the phaselocked loop, which has, to be used to produce high-frequency clock pulse by the phaselocked loop inside FPGA
The double frequency function of signal；
The porch extraction module is real by the edge type d type flip flop inside FPGA, 2 inputs and gate circuit and phase inverter
It is existing, for extracting the forward position of 1KHz and 4KHz square-wave pulse signals；
The alien frequencies quantization phase demodulation module is realized that the level-type rest-set flip-flop has two signals by level-type rest-set flip-flop
Input, for producing the phase difference pulse between reference signal and measured signal；
The phase difference pulse processing module realizes that the self-compiling program controller is used by the self-compiling program controller inside FPGA
In phase difference pulse is carried out into quantization by unit of the greatest common factor (G.C.F.) cycle, the arteries and veins using least common multiple one number time as interval is produced
Rush synchronizing signal and step-by-step counting control signal；
The pulse counter module includes 3 function identical counters, this 3 counter combination step-by-step counting control signals point
The complete cycle of measured signal, the complete cycle of reference signal and phase difference pulse width Yong Yu not counted and counted
Value；
The signal output part of the reference signal source module is connected with the signal input part of the first frequency conversion module, described
The signal output part of measured signal source module is connected with the signal input part of the second frequency conversion module, the first frequency
The signal output part of conversion module is connected with the signal input part of the analog signal processing module, and the second frequency becomes mold changing
The signal input part of block and the signal output part of analog signal processing module with the allocator module is connected, the simulation letter
Signal input part of the signal output part of number processing module also with the phase locking frequency multiplying module is connected；The phase locking frequency multiplying module
Signal output part is connected with the clock end of an edge type d type flip flop in the porch extraction module, the allocator module
1KHz signal output parts and 4KHz signal output parts respectively with an edge type d type flip flop in the porch extraction module
Signal input part is connected, and the signal output part of each edge type d type flip flop is connected with a phase inverter respectively, for allocator module
The 1KHz signals and 4KHz signals of output, the original signal and its reverse signal of each signal pass through the porch extraction module
In one 2 inputs and gate circuit take with so as to export phase by two signal output parts of the porch extraction module
The signal leading edge of induction signal；Two signal output parts of the porch extraction module respectively with the alien frequencies quantization phase demodulation
In module level-type rest-set flip-flop two signal input parts connection, the signal output part of the alien frequencies quantization phase demodulation module with
The signal input part connection of the phase difference pulse processing module, the signal output part of the phase difference pulse processing module and institute
State three in pulse counter module pulse counters to connect respectively, the signal output part of three pulse counters is and institute
State the connection of count value memory module.
2. the High Precise Frequency Measurement System according to claim 1 based on moving emitter, it is characterised in that the meter
Numerical value memory module is realized by the memory inside FPGA, for the count value that each counter obtains in pulse count module
Stored.
3. the High Precise Frequency Measurement System according to claim 2 based on moving emitter, it is characterised in that described to deposit
Reservoir is FIFO memory cell.
4. the High Precise Frequency Measurement System according to claim 1 based on moving emitter, it is characterised in that the meter
Number device is realized by the counter unit inside FPGA.
5. the High Precise Frequency Measurement System according to claim 1 based on moving emitter, it is characterised in that also include
For the host computer for carrying out data processing and frequency is shown, the host computer obtains counting at the count value memory module
Value, the frequency values of measured signal are resolved according to count value and frequency measurement algorithm, and frequency values are shown.
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